The discovery of sex-linked genes and production of the first chromosome map came from studies of
a. pea plants.
b. corn.
c. humans.
d. fruit flies.
e. mice.
D
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Exposure to light redistributes auxin to the opposite side of the stem or root that is exposed to light. In stems, this redistribution of auxin results in the stem growing and bending toward the light
In contrast, roots bend away from the light as they grow. What may be an advantage of the difference in bending of roots and stems? A. When stems bend toward the light as they grow, the leaves will shade the stem and keep it from getting too hot. B. When roots grow away from the light, they will grow deeper into the soil where they can absorb water and nutrients. C. When roots grow away from the light, the root cap will not be lost. D. When roots grow away from the light, light sensitive statoliths drive the bending of the cells back to the ground.
Oral rehydration solutions that contain both salt and glucose are highly effective in treating severe dehydration caused by diarrhea and vomiting. However, glucose or salt alone are not effective. Why?
A. Sodium transport and glucose transport are coupled in the small intestine so that glucose accelerates absorption of salt and water. B. Water alone rushes through the digestive tract too quickly to be absorbed by the body tissues. C. ATP is required to transport sodium unless glucose is available for cotransport. D. Glucose without sodium is broken down too quickly in the mouth by saliva.
If a dihybrid cross is begun with a P1 generation of a true-breeding plant that produces smooth and yellow peas
(smooth and yellow are both dominant traits), crossed with a plant that produces wrinkled green peas (wrinkled and green are both recessive traits), the F1 plants will all be smooth and yellow. a. True b. False
All infections result in disease.
Answer the following statement true (T) or false (F)